Sorry for leaving your post unanswered. I don’t suffer from vertigo, but a study of PWP four years ago was set up to investigate vertigo. It found that in the study group, 5.3% had a condition called Benign Positional Vertigo.
This, as you can tell from the name, is nothing to worry about, though it is a pest. As you’ve discovered, it’s easy to treat with medication.
It sounds very much like this is what you have. As I’ve said, it’s nothing serious. Just as it started fairly suddenly, it can disappear spontaneously. Just take the tablets when it kicks off until such time when it leaves you.
So it’s not migraine, it is probably one of the Parkinson’s Fairy’s little gifts.